when i began the tutorial that appears in the documentation, i followed all the stebs one by one, i created my first app as the documentation said, i did the command ionic serve , no problem on this point, the app works fine on the port 8100, cool :D.
Then i decided to create another project, withs command lineionic start MyProject super
because i wanted to see all the functionalities; Then i wrote the same comand to serve ionic serve the CLI told me that it is serve in localhost:8100, just as the before project, the i went to open it on the browser and when i did it, the before project was ther, i refresh the page because it was on ths same port than the new project, i though doing this it’d show me the new project that i’ve already create, but it not happens; So i thought, well, maybe i have to close the other server that were opens with the first project, i’ve read some that said that could work if i use the combination CTRL + C or the q one on the CLI, i did it, with q command and nothig happened, actually the CLI saids it is a not recognized command, so i proved with CTRL + C the CLI ask me if i wish to finish the work, so i put y so i thought it was solve, i went to the browser and it keeps running the first project i did for the tutorial, so i decided to restar my computer, i thought with this all the servers i did with ionic will close. I did it and with with just open the browser and go to localhost:8100 the server of the first project created to follow the tutorial, keeps running even when i restar my computer and when i just open my browser to search it, i did not open my CLI, nothing

actually i’ve proved with a lot of modalities to creating projects likeionic start MyProject superionic start MyProject tabs
and always i did the command ionic serve happened the same thing
I proved that comand ionic serve -p 8101 to open it with othet port, and it works with other port if i use the module Blank, but with Super doesn’t work with any port, with super if i made it with port 8100 it still open the tutorial project, but i’ve i proved with other port this appears in CLI and browser

Updates:
-if i use CTRL + C in other ports it works, that means the connection is close and the url localhost:xxx don’t work, that is what should happend with the port 8100, i will do a restart as @Sujan12 saids, and i’ll tell you how it wors

Apparently it is solve.
what i’ve do:
restart my computer as @Sujan12 said creating a shotcut, and it works, but then i made ionic serve again on port 8100 and works fine the problem was when i did with other app, again block in that por even when i did CTRL + C, so i restart the pc normally again ant the problem keeps, the solution of @Sujan12works, but i can’t restart with shortcut each time i work in other app, it is useles, i mean i can chage the port with other project/app, but again it is useless; So the problems persist, then i uninstall node.js and then i clean my browser cache and cookies as @trevaun23 saids now it, woks, now if i close one server a star another app in the same port localhost:8100 it’s works.